Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (10): 2908-2921.doi: 10.13229/j.cnki.jdxbgxb.20221623

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Effect of different stone powder and content on properties of high ductility engineered cementitious composites

Ben-tian YU1(),Yan-xiao LI1,Zhan-xu ZHANG2,Jun-hui SU2,Chao XIE1,Kai ZHANG1   

  1. 1.School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou 730070，China
    2.Gansu Road & Bridge Fourth Engineering Co. ，Ltd. ，Lanzhou 730030，China
  • Received:2022-12-25 Online:2024-10-01 Published:2024-11-22
  • Contact: Ben-tian YU E-mail:yubentian@mail.lzjtu.cn

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Abstract:

The macroscopic mechanical properties， autogenous shrinking properties and microstructural properties of engineered cementitious composites （ECC） prepared from granitic porphyry powder （GP）， limestone powder （LP） and quartz powder （QP） with the mass of 20%， 40%， 60%， 80% and 100% instead of river sand were studied. The mechanical property test results show that： The peak stress and ultimate strain of each tensile specimen first decreased and then increased with the increase of stone powder substitution rate， while the uniaxial compressive strength and flexural strength increased with the increase of stone powder substitution rate， when the stone powder substitution rate was 100%， the mechanical properties of each specimen were optimal， and the peak tensile stress reached 4.4 MPa and above， and the ultimate strain exceeded 4.2%， its uniaxial compressive strength is more than 50 MPa， and its flexural strength is more than 18 MPa. Compared with the reference group， the mechanical properties of the specimens were greatly improved. Autogenous shrinkage test results show that： the autogenous shrinkage of each specimen becomes larger with the increase of stone powder substitution rate， when completely substituted， the autogenous shrinkage of doped GP， LP， QP increased 117.3%， 127.3%， 119.5% respectively compared with the benchmark specimens， for this reason， the stability of the matrix is adversely affected by the replacement of river sand by stone powder. The microscopic test results show that adding stone powder can be used as the nucleation matrix of hydration products and promote the reaction， and the limestone powder has the best promotion effect. When the content of each stone powder is large， the dispersion of polyvinyl alcohol（PVA） fiber in the matrix is improved， and the matrix and fiber can jointly bear the load and coordinate the deformation， making full use of the strength of the matrix and fiber. The logistic model was used to fit the autogenous shrinkage test results， and the obtained ECC self-shrinkage prediction model predicted better， and the validation found that this model has certain applicability.

Key words: engineered cementitious composites（ECC）, granitic porphyry powder, limestone powder, quartz powder, polyvinyl alcohol fiber, autogenous shrinkage, microstructure

CLC Number: 

  • TU528

Table 1

Fiber performance"

长度12 mm拉伸强度1 560 MPa
直径40 μm伸长率6.5%
密度1.30 g/cm3弹性模量41GPa

Table 2

River sand particle size"

筛孔大小/mm<0.150.150.300.60
累计筛余率/%10097.0589.5262.29

Table 3

Chemical composition of stone powder"

石粉类型SiO2/%Fe2O3/%Al2O3/%CaCO3/%MgO/%CaO/%其他
GP77.33.517.6—0.50.60.5
LP—0.21.597.20.3—0.8
QP96.00.91.7—0.40.60.4

Fig.1

Apparent morphology of three kinds of stone powders and fiber"

Fig.2

Particle size distribution curves of three kinds of stone powders"

Fig.3

XRD spectrum of three kinds of stone powders"

Table 4

ECC preparation mixes"

试验编号水胶比砂胶比细骨料石粉种类PVA/vol%减水剂/ ‰
河砂/ %石粉/ %
ECC-JZ

0.4

0.65

1000/

2.5

3.0
GP18020GP5.0
GP260405.5
GP340607.0
GP4208011.0
GP5010015.0
LP10.40.658020LP2.54.0
LP260404.5
LP340605.0
LP420805.5
LP501006.0
QP10.40.658020QP2.54.5
QP260405.0
QP340605.5
QP420806.0
QP501006.5

Fig.4

Tensile specimen size and loading apparatus"

Fig.5

Crack development degree of each tensile specimen"

Fig.6

Tensile stress-strain curves of different granitic porphyry powder substitution rates"

Fig.7

Tensile stress-strain curves of different limestone powder substitution rates"

Fig.8

Tensile stress-strain curves of different quartz powder substitution rates"

Fig.9

Variation curves of peak stress and ultimate strain"

Fig.10

Uniaxial compressive strength of three powders at different substitution rates"

Fig.11

Flexural strength of three powders at different substitution rates"

Fig.12

Autogenous shrinkage curves of different granitic porphyry powder substitution rates"

Fig.13

Autogenous shrinkage curves of different limestone powder substitution rates"

Fig.14

Autogenous shrinkage curves of different quartz powder substitution rates"

Fig.15

XRD spectrum of different granitic porphyry powder substitution rates"

Fig.16

XRD spectrum of different limestone powder substitution rates"

Fig.17

XRD spectrum of different quartz powder substitution rates"

Fig.18

SEM images of tensile specimens in the reference group after damage"

Fig.19

SEM images of tensile specimens of granite porphyry powder after damage"

Fig.20

SEM images of tensile specimens of limestone powder after damage"

Fig.21

SEM images of tensile specimens of quartz powder after damage"

Fig.22

Comparison of the autogenous shrinkage curve and fitted curve of GP"

Fig.23

Comparison of autogenous shrinkage curve and fitted curve of LP"

Fig.24

Comparison of the autogenous shrinkage curve and the fitted curve of QP"

Fig.25

Verification results of ECC autogenous shrinkage prediction model"

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